在javascript中使用正则表达式在单词的两侧添加空格
我想在每一侧添加空间在javascript中使用正则表达式在单词的两侧添加空格,javascript,regex,Javascript,Regex,我想在每一侧添加空间 apple Case1: var str = 'Anapple a day'; // space needed on left Case 2: var str = 'An apple a day; // remove 1 space from left Case 3: var str = 'An applea day'; //space needed on right str = str.replace(/ apple/g, 'apple ');
apple
Case1:
var str = 'Anapple a day'; // space needed on left
Case 2:
var str = 'An apple a day; // remove 1 space from left
Case 3:
var str = 'An applea day'; //space needed on right
str = str.replace(/ apple/g, 'apple '); // adds a space to the right
str = str.replace(/apple /g, ' apple'); // adds a space to the left
str = str.replace(/apple/g, ' apple '); // adds a space on either side
我们可以将所有3合1替换组合起来吗?您只需一个regexp即可:
'Anapplea day'.replace(/\s*apple\s*/g, ' apple ');
\s*
匹配零个或多个空白字符